Electronic variator for mini drill

[OBones]

Hi all

I've got a mini drill powered by a 12V transformer. Problem is that it
is an On/Off drill, no variation in the power applied to it.
I'm looking for leads on what to look for in order to build an
electronic variator system.
I already know about variable voltage regulators, but they dissipate the
difference into heat, which is not really desirable.
Any help greatly appreciated

Cheers
Olivier

 

[Luhan Monat]

OBones wrote:

Hi all

I've got a mini drill powered by a 12V transformer. Problem is that it
is an On/Off drill, no variation in the power applied to it.
I'm looking for leads on what to look for in order to build an
electronic variator system.
I already know about variable voltage regulators, but they dissipate the
difference into heat, which is not really desirable.
Any help greatly appreciated

Cheers
Olivier

AC or DC ?

--
Luhan Monat: luhanis(at)yahoo(dot)com
http://members.cox.net/berniekm
"Any sufficiently advanced magick is
indistinguishable from technology."

 

[OBones]

Luhan Monat wrote:

OBones wrote:

Hi all

I've got a mini drill powered by a 12V transformer. Problem is that it
is an On/Off drill, no variation in the power applied to it.
I'm looking for leads on what to look for in order to build an
electronic variator system.
I already know about variable voltage regulators, but they dissipate
the difference into heat, which is not really desirable.
Any help greatly appreciated

Cheers
Olivier


AC or DC ?

DC, +12V

 

[petrus bitbyter]

"OBones" <obones_gfd_@_gds_altern.org> schreef in bericht
news:428fc7e2$0$6672$636a15ce@news.free.fr...

Luhan Monat wrote:

OBones wrote:

Hi all

I've got a mini drill powered by a 12V transformer. Problem is that it
is an On/Off drill, no variation in the power applied to it.
I'm looking for leads on what to look for in order to build an
electronic variator system.
I already know about variable voltage regulators, but they dissipate the
difference into heat, which is not really desirable.
Any help greatly appreciated

Cheers
Olivier


AC or DC ?

DC, +12V

I'd use PWM. A 555 in astable mode with a potmeter to vary the dutycycle and
a (darlington) power transistor to drive the drill.

petrus bitbyter

 

[OBones]

petrus bitbyter wrote:

"OBones" <obones_gfd_@_gds_altern.org> schreef in bericht
news:428fc7e2$0$6672$636a15ce@news.free.fr...

Luhan Monat wrote:


OBones wrote:


Hi all

I've got a mini drill powered by a 12V transformer. Problem is that it
is an On/Off drill, no variation in the power applied to it.
I'm looking for leads on what to look for in order to build an
electronic variator system.
I already know about variable voltage regulators, but they dissipate the
difference into heat, which is not really desirable.
Any help greatly appreciated

Cheers
Olivier


AC or DC ?

DC, +12V


I'd use PWM. A 555 in astable mode with a potmeter to vary the dutycycle and
a (darlington) power transistor to drive the drill.

petrus bitbyter

Thanks, that's what I'm considering as well, though using a MOSFET (more
current, less dissipation)